function question_find_file_links_from_html in Quiz 6.6

Same name and namespace in other branches

1. 6.5 includes/moodle/lib/questionlib.php \question_find_file_links_from_html()

File

includes/moodle/lib/questionlib.php, line 2252

Code

function question_find_file_links_from_html($html, $courseid) {
  global $CFG;
  $baseurl = question_file_links_base_url($courseid);
  $searchfor = '!' . '(<\\s*(a|img)\\s[^>]*(href|src)\\s*=\\s*")' . $baseurl . '([^"]*)"' . '|' . '(<\\s*(a|img)\\s[^>]*(href|src)\\s*=\\s*\')' . $baseurl . '([^\']*)\'' . '!i';
  $matches = array();
  $no = preg_match_all($searchfor, $html, $matches);
  if ($no) {
    $rawurls = array_filter(array_merge($matches[5], $matches[10]));

    //array_filter removes empty elements

    //remove any links that point somewhere they shouldn't
    foreach (array_keys($rawurls) as $rawurlkey) {
      if (!($cleanedurl = question_url_check($rawurls[$rawurlkey]))) {
        unset($rawurls[$rawurlkey]);
      }
      else {
        $rawurls[$rawurlkey] = $cleanedurl;
      }
    }
    $urls = array_flip($rawurls);

    // array_flip removes duplicate files
    // and when we merge arrays will continue to automatically remove duplicates
  }
  else {
    $urls = array();
  }
  return $urls;
}